| Zip Code | City | Population ↓ |
|---|---|---|
| 42025 | Benton | 18,836 |
| 42029 | Calvert City | 6,092 |
| 42044 | Gilbertsville | 3,953 |
| 42048 | Hardin | 2,314 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 4 ZCTAs in Marshall County, Kentucky (US Census).